A lot of refactoring.
Merge branch 'development' of https://github.com/SETeam42014/test.git
into development

Conflicts:
	POS/src/ee/ut/math/tvt/salessystem/ui/panels/PurchaseItemPanel.java
Merged
Database implemented to goods sale.
Database should now have tables
Database tables should now be done
Merge branch 'development' of https://github.com/SETeam42014/test.git into development
Removed SalesSystemModel variable.
Removed direct communication with model.
Rolled back to working commit.
Merge branch 'development' of https://github.com/SETeam42014/test.git
into development

Conflicts:
	POS/src/ee/ut/math/tvt/salessystem/ui/panels/PurchaseItemPanel.java
	POS/src/ee/ut/math/tvt/salessystem/ui/tabs/HistoryTab.java
	POS/src/ee/ut/math/tvt/salessystem/ui/tabs/PurchaseTab.java